function ExtWarning(msg,callback)
{
	Ext.Msg.show({
		title:'提示',
		msg:'<b>'+msg+'</b>',
		buttons:{ok:'确定'},
		icon: Ext.MessageBox.INFO,
		maxWidth :300,
		minWidth :300,
		closable:false,
		defaultTextHeight:100,
		fn:function(btn,text){
			if(btn=='ok'){
				if(typeof callback !='undefined'){
					callback();
				}
			}
		}
	});
}